Center member assemblies for Thomas DBZ, DBZ-A, and DBZ-B couplings. Include center member, disc packs, and disc pack hardware.
| Construction type | Block |
| Datum diameter | 5.6000 in, 142.24 mm |
| I.D. | 1/2 to 2 11/16 in |
| Material | Cast iron |
| Number of grooves | 3.0000 |
| O.D. (in) | 6.35, O.D. (in):6.3500 , 161.29 mm |